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People walk past a board displaying currency exchange rates in Kiev February 26, 2015. Ukraine's central bank unexpectedly banned most currency trading on Wednesday, only to abruptly reverse the decision overnight, causing havoc in the market for the plunging hryvnia. A separatist war in the east of the country has made it difficult to stabilise an economy on the verge of bankruptcy, and the hryvnia currency has already lost more than half its value so far this year after halving during all of 2014. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: BUSINESS POLITICS CIVIL UNREST)